Mary Pope Osborne

Their magic tree house takes Annie and Jack to Pompeii just as Vesuvius is about to erupt, and they must find a Roman scroll before everything is covered with burning ash.

"Jack and Annie are magically transported to mid-1800's Thebes where they are saved from a dangerous accident by Florence Nightingale!"--

"The magic tree house whisks Jack and Annie away to South America, where they must climb Machu Picchu to save a baby llama"--

"The magic tree house whisks Jack and Annie to Africa where they must use magic to save a rhino and her baby from poachers"--

The #1 bestselling chapter book series of all time celebrates 25 years with new covers and a new, easy-to-use numbering system! Getting the facts behind the fiction has never looked better.  Track the facts with Jack and Annie!!
 
When Jack and Annie got back from their adventure in Magic Tree House #3: Mummies in the Morning, they had lots of questions. Why did people make mummies? What was the mysterious writing...

A collection of tall tales about such American folk heroes as Sally Ann Thunder Ann Whirlwind, Pecos Bill, John Henry, and Paul Bunyan.

"Jack and Annie are whisked away to Mongolia to meet the near-extinct little horses and their caretakers, but can they help protect the last of the horses from predators?"--

Books 9–16 of the New York Times bestselling Magic Tree House series!
These eight titles are the perfect gift for a Magic Tree House fan or any child who loves a good adventure. Parents, teachers, and librarians hail the chapter-book series as a tool to promote reading, as even the most reluctant readers want to know where the Magic Tree House will take the brother-and-sister team next.
 
In books 9–12,...

Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle.